Abstract:

Ultrasonic was applied to the extraction of bioactive components in Chinese fringe tree young leaf tea and flower tea, including polyphenols, flavooids and ploysacchrides. The contents of these components and seven macro-mineral elements including Cu, Fe, Pb and so on in the two tea samples were determined using ferrous tartrate colorimetric, UV/VIS spectrophotometric, phenol-sulfuric acid cololrimetric or atomic absorption spectrophotometric methods. Chinese fringe tree young leaf tea and flower tea had polyphenol contents of 301.7 mg/g and 227.0 mg/g, flavonoid contents of 47.925 mg/g and 62.025 mg/g and polysaccharide contents of 64.674 mg/g and 71.341 mg/g, respectively. The two types of tea were both rich in mineral elements, especially Ca and Mg, of which the contents were 4165.7μg/g and 329.75μg/g in the young leaf tea and 6193.50μg/g and 344.50μg/g in the flower tea, respectively. The polyphenol content of the young leaf tea was even higher than that of the flower tea. Therefore, Chinese fringe tree young leaf tea may be a tea that has superior anti-aging benefits for human body.

Key words: Chinese fringe tree, bioactive components, extraction, determination